Sr Full Stack Developer AI Native
About The Position
Pennymac (NYSE: PFSI) is a specialty financial services firm with a comprehensive mortgage platform and integrated business focused on the production and servicing of U.S. mortgage loans and the management of investments related to the U.S. mortgage market. At Pennymac, our people are the foundation of our success and at the heart of our dynamic work culture. Together, we work towards a unified goal of helping millions of Americans achieve aspirations of homeownership through the complete mortgage journey. A Typical Day Design, develop, and maintain web applications using React, Ruby on Rails, Node.JS, HTML, CSS/SASS, JavaScript, Bootstrap, SQL, and related technologies. Leverage AI coding tools (Cursor, Copilot) to accelerate development while ensuring code quality and maintainability. Build responsive, pixel-perfect web pages from design mockups. Write clean, secure, and efficient code following best practices and standards. Collaborate with product and design teams to translate user needs into technical solutions that drive measurable impact. Rapidly prototype and iterate on solutions, shipping user-facing products with measurable impact. Participate in code reviews to ensure quality and security across the application stack. Troubleshoot complex technical issues with a focus on performance and security. Identify opportunities to improve processes, systems, and the overall user experience with a product-focused mindset. Mentor junior developers and foster a culture of user-focused, secure development. Why You Should Join As one of the top mortgage lenders in the country, Pennymac has helped over 4 million lifetime homeowners achieve and sustain their aspirations of home. Our vision is to be the most trusted partner for home. Together, 4,000 Pennymac team members across the country are guided by our core values: to be Accountable, Reliable and Ethical in all that we do. Pennymac is committed to conducting a business that makes positive contributions and promotes long-term sustainable growth and to fostering an equitable and inclusive environment, where all employees and customers feel valued, respected and supported.
Requirements
- 3+ years of full-stack software development experience in production environments
- 2+ years of experience using TypeScript across front-end and back-end contexts
- Expert-level proficiency in ReactJS and modern front-end development patterns
- Strong foundation in backend engineering - Node.JS preferred, including:
- Scalable API design (REST or GraphQL)
- Database schema design and optimization
- Proven experience as a Full Stack Developer with strong front-end and back-end skills.
- Experience using AI coding tools (e.g., Copilot, Cursor) in professional development workflows.
- Track record of shipping user-facing products with measurable impact.
- Node.JS experience preferred, including API design, database schema, authentication, and concurrency management.
- Strong proficiency in building responsive web applications that match design specifications.
- Experience with version control systems such as GitLab or GitHub.
- Excellent problem-solving and analytical skills with attention to both security and user experience.
- Strong communication skills and ability to work independently in an agile team.
Nice To Haves
- Experience with "vibe coding" - rapid prototyping using AI tools while maintaining architectural integrity.
- Familiarity with Ruby on Rails, Jekyll, TypeScript, or Python.
- Knowledge of web accessibility standards (WCAG).
- Experience building LLM-powered features or AI agent systems.
Responsibilities
- Design, develop, and maintain web applications using React, Ruby on Rails, Node.JS, HTML, CSS/SASS, JavaScript, Bootstrap, SQL, and related technologies.
- Leverage AI coding tools (Cursor, Copilot) to accelerate development while ensuring code quality and maintainability.
- Build responsive, pixel-perfect web pages from design mockups.
- Write clean, secure, and efficient code following best practices and standards.
- Collaborate with product and design teams to translate user needs into technical solutions that drive measurable impact.
- Rapidly prototype and iterate on solutions, shipping user-facing products with measurable impact.
- Participate in code reviews to ensure quality and security across the application stack.
- Troubleshoot complex technical issues with a focus on performance and security.
- Identify opportunities to improve processes, systems, and the overall user experience with a product-focused mindset.
- Mentor junior developers and foster a culture of user-focused, secure development.
Benefits
- Comprehensive Medical, Dental, and Vision
- Paid Time Off Programs including vacation, holidays, illness, and parental leave
- Wellness Programs, Employee Recognition Programs, and onsite gyms and cafe style dining (select locations)
- Retirement benefits, life insurance, 401k match, and tuition reimbursement
- Philanthropy Programs including matching gifts, volunteer grants, charitable grants and corporate sponsorships
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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
Education Level
No Education Listed
Number of Employees
5,001-10,000 employees
